射频功分器与滤波器的融合设计研究

发布时间：2019-01-23 18:34

【摘要】：在射频系统中,功分器与滤波器是两款重要的无源器件。功率分配器是一种将一路输入信号能量等量或者不等量分成两路或多路输出的器件,也可反过来将多路信号能量合成一路输出,此时可也称为合路器。根据结构可分为威尔金森功分器,Gysel功分器,魔T,耦合器,环形器等。而滤波器的功能就是允许某一部分频率的信号顺利的通过,而抑制另外一部分频率的信号。这两款器件经常被同时应用于现代无线通信系统中,在射频电路中占据很大的面积,使得整个射频系统过于庞大。为了实现整体的小型化,可以通过将功分器与滤波器集成在一起设计,这样不仅能缩减系统体积,减少系统成本,还能在一定的程度上提高系统的性能。本课题在深入研究滤波器与功分器集成技术的前提下,设计几款新型的电路方案,具有功率分配与滤波两种性能,本论文的主要工作包括:(1)具有滤波功能的威尔金森功分器;这一章主要设计了三个电路,第一个通过采用五个谐振器相互耦合的方式实现滤波功能和等分功率分配的功能,第二个电路是在第一个电路的基础上,通过调节谐振器之间的耦合强度实现不等分功率分配。第三个电路通过采用具有谐波抑制的滤波结构替代传统威尔金森功分器四分之一波长,在实现小型化的同时实现宽阻带的特性。(2)具有滤波功能的Gysel任意功分比功率分配器;通过采用具有K变换器响应特性的滤波结构融合到Gysel功分器的中,在实现滤波与功分特性的同时,提高功分器的功率分配比。此外,利用功分器的隔离电阻提高滤波结构的带外抑制。(3)具有滤波功能的混合环。这一章主要提出了两个宽阻带小型化的滤波结构,这两个结构分别具有±K变换器的特性,用来替混合环中的四分之一波长微带线和四分之三波长微带线。使得混合环具有宽阻带的滤波效果,同时实现小型化。
[Abstract]:Power divider and filter are two important passive devices in RF system. The power divider is a kind of device which divides the energy of one input signal into two or multiple outputs, and in turn combines the energy of multiple signals into one output, which is also called combiner. According to the structure can be divided into Wilkinson power divider, Gysel power divider, magic T, coupler, ring, etc. The function of filter is to allow the signal of one part of frequency to pass smoothly, and to suppress the signal of other part of frequency. These two devices are often used in modern wireless communication systems at the same time. They occupy a large area in RF circuits and make the whole RF system too large. In order to realize the overall miniaturization, the power divider and filter can be integrated together, which can not only reduce the volume of the system, reduce the cost of the system, but also improve the performance of the system to a certain extent. On the premise of deeply studying the integrated technology of filter and power divider, this paper designs several new circuit schemes, which have two kinds of performance: power distribution and filter. The main work of this thesis includes: (1) Wilkinson splitter with filter function; In this chapter, three circuits are designed, the first is to realize the filtering function and the function of equal power distribution by using the coupling of five resonators, and the second circuit is based on the first circuit. The unequal power distribution is realized by adjusting the coupling strength between resonators. The third circuit uses a filter structure with harmonic suppression to replace the traditional Wilkinson splitter 1/4 wavelength. The characteristics of wide stopband are realized while miniaturization. (2) Gysel power divider with filter function; The filter structure with K converter response characteristic is fused into the Gysel power divider to realize the filter and power division characteristics and to improve the power distribution ratio of the power divider. In addition, the isolation resistance of the power divider is used to improve the out-of-band suppression of the filter structure. (3) the hybrid loop with filtering function. In this chapter, two wide stopband miniaturized filter structures are proposed. The two structures have the characteristics of 卤K converter, which are used to replace the 1/4 wavelength microstrip line and 3/4 wavelength microstrip line in the hybrid loop. The hybrid ring has the effect of wide stopband filtering and miniaturization.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN626;TN713

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